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A monomino is a polyomino of order 1, that is, a polygon in the plane made of one equal-sized square. [1] When rotations and reflections are not considered to be distinct shapes, there is only one free monomino.
In other words, monomino just means a square.
Since it has reflection symmetry, it is also the only one-sided domino (with reflections considered distinct). When rotations are also considered distinct, there is still one fixed monomino.
